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塔中区块高温高压裂缝性气藏封堵层气蚀剪切失效机理

苏晓明 吴若宁 赵常举 王启任 袁媛 熊汉桥

苏晓明, 吴若宁, 赵常举, 王启任, 袁媛, 熊汉桥. 塔中区块高温高压裂缝性气藏封堵层气蚀剪切失效机理[J]. 地质科技通报, 2022, 41(4): 21-29. doi: 10.19509/j.cnki.dzkq.2021.0059
引用本文: 苏晓明, 吴若宁, 赵常举, 王启任, 袁媛, 熊汉桥. 塔中区块高温高压裂缝性气藏封堵层气蚀剪切失效机理[J]. 地质科技通报, 2022, 41(4): 21-29. doi: 10.19509/j.cnki.dzkq.2021.0059
Su Xiaoming, Wu Ruoning, Zhao Changju, Wang Qiren, Yuan Yuan, Xiong Hanqiao. Failure mechanism of cavitation-induced shear of the plugging layer in high-temperature high-pressure fractured gas reservoirs in the Tazhong block, NW China[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 21-29. doi: 10.19509/j.cnki.dzkq.2021.0059
Citation: Su Xiaoming, Wu Ruoning, Zhao Changju, Wang Qiren, Yuan Yuan, Xiong Hanqiao. Failure mechanism of cavitation-induced shear of the plugging layer in high-temperature high-pressure fractured gas reservoirs in the Tazhong block, NW China[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 21-29. doi: 10.19509/j.cnki.dzkq.2021.0059

塔中区块高温高压裂缝性气藏封堵层气蚀剪切失效机理

doi: 10.19509/j.cnki.dzkq.2021.0059
基金项目: 

甘肃省高等学校创新基金项目 2021B-281

兰州城市学院博士科研基金项目 LZCU-BS2021-02

兰州城市学院青年基金项目 LZCU-QN2021-02

详细信息
    作者简介:

    苏晓明(1990-), 男, 讲师, 主要从事储层保护理论与技术、油气井工作液与力学研究工作。E-mail: sxm310426@126.com

  • 中图分类号: TE28

Failure mechanism of cavitation-induced shear of the plugging layer in high-temperature high-pressure fractured gas reservoirs in the Tazhong block, NW China

  • 摘要:

    为了深入了解塔中区块高温高压裂缝性气藏封堵层失效问题, 基于储层特征和流体特性的深入分析, 结合封堵层微尺度物理结构特征, 对高温高压裂缝性气藏封堵层失效特征进行了研究, 提出了封堵层气蚀剪切失效概念, 构建了封堵层气蚀剪切失效的物理模型, 并借助颗粒物质力学和液桥理论, 对封堵层气蚀剪切失效过程进行了深入研究, 并基于反向气蚀原理, 开展了室内反向承压实验研究。研究结果表明, 裂缝性封堵层"气蚀剪切"失效作为一种气藏封堵层特有的失效模式, 其发生过程分为3个阶段: 气体扩散降黏破坏、气蚀剪切剥离破坏和气液置换错位剪切破坏; 正向承压6 MPa的统一封堵层, 对于不同属性的流体其抗剪切破坏能力不同, 当反向驱替流体由柴油转变为氮气时, 封堵层的反向承压值由原来的2.0 MPa(22 min)和2.5 MPa(30 min)分别减小到后来的1.5 MPa(10 min)和1.0 MPa(12 min), 综合抗剪切性能降低了约50%, 表明气体具有与液体不同的破坏能力和机制。

     

  • 图 1  不同流场中封堵层结构示意图

    F为封堵层两端作用力的合力;Fw为井底流体作用力;Ff为地层流体作用力

    Figure 1.  Schematic diagram of the plugging layer in different flow fields

    图 2  塔中区块奥陶系储层压力温度分布特征

    Figure 2.  Pressure and temperature distribution characteristics of the Ordovician reservoir in the Tazhong block

    图 3  塔中区块奥陶系储层裂缝分布特征

    Figure 3.  Fracture distribution characteristics of Ordovician reservoirs in the Tazhong block

    图 4  裂缝性封堵层多尺度特征示意图

    Figure 4.  Multiscale characteristics of the fractured plugging layer

    图 5  裂缝性封堵层失效前结构示意图

    Figure 5.  Structure diagram of the fractured plugging layer before failure

    图 6  气体扩散降黏过程示意图

    Figure 6.  Schematic diagram of the gas diffusion viscosity reduction process

    图 7  气蚀剪切剥离过程示意图

    Figure 7.  Schematic diagram of the cavitation shear stripping process

    图 8  封堵层气液置换错位剪切失稳过程示意图

    Figure 8.  Schematic diagram of the shear instability process of gas-liquid displacement mismatch in the plugging layer

    图 9  静态封堵评价装置结构示意图

    Figure 9.  Structure diagram of the static plugging evaluation device

    图 10  钢制裂缝岩心示意图

    Figure 10.  Schematic diagram of the steel fractured core

    表  1  塔中区块试验井储层段岩心全烃含量统计结果

    Table  1.   Statistical results of total hydrocarbon content in cores collected from tested wells in the Tazhong block

    井深/m 钻时效率/(min·m-1) TG C1 C2 C3 iC4 nC4 iC5 nC5
    wB/%
    7 319 76 61.013 53.909 5 0.077 6 0.004 1 0.000 6 0.005 6 0.000 6 0.001 5
    7 320 54 54.779 48.323 4 0.073 8 0.005 5 0.001 1 0.001 9 0.000 6 0.004 1
    7 321 28 55.049 48.533 7 0.075 4 0.005 6 0.000 6 0.003 1 0.000 6 0.003 3
    7 322 37 55.822 49.516 2 0.076 0 0.007 0 0.000 6 0.002 8 0.001 1 0.005 3
    7 323 34 59.339 52.684 1 0.079 1 0.005 9 0.000 6 0.003 0 0.002 4 0.005 3
    7 324 30 66.133 58.868 7 0.086 0 0.007 3 0.000 9 0.004 9 0.002 3 0.004 7
    7 325 26 66.226 61.030 8 0.091 4 0.007 2 0.001 0 0.001 4 0.000 9 0.005 2
    下载: 导出CSV

    表  2  裂缝正向承压封堵实验

    Table  2.   Fracture forward pressure-bearing plugging experiment

    裂缝形状 裂缝宽度/mm 正向承压值/MPa 累计漏失量/mL 临界封堵时间/min
    平行缝 2×2 6 16 17
    楔形缝 2×1.5 6 10 15
    平行缝 2×2 6 14 19
    楔形缝 2×1.5 6 12 13
    注:正向承压值是指封堵层形成的承压值(MPa);临界封堵时间是指完全形成封堵层不再发生漏失时的时间(min)
    下载: 导出CSV

    表  3  封堵层反向承压评价实验

    Table  3.   Reversed pressure-bearing evaluation experiment of the plugging layer

    反向驱替流体 裂缝形状 裂缝宽度/mm 反向承压值/MPa 临界时间/min
    0#柴油 平行缝 2×2 2.0 22
    楔形缝 2×1.5 2.5 30
    氮气(N2) 平行缝 2×2 1.5 10
    楔形缝 2×1.5 1.0 12
    注:反向承压值是指进行反向驱替时封堵层所能承受的最大压力值(MPa);临界时间是反向驱替过程中封堵层发生破坏时的时间
    下载: 导出CSV
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  • 收稿日期:  2021-03-15
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